I can take this up a notch. As a Federal Agent, I had cause to walk down a busy street in the main section of the city, with a handgun IN MY HAND. I was in a suit (just like everyone else), had my hand at my side (just like most folks pre-cell phones), walked casually but 'with purpose' (just like everyone else), and no one noticed!
(We did get our guy that day.)
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Sleuth
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